In legal terms, "Chinese investors" are defined as those who require FIRB approval for their residential property purchases.

This figure is obtained by dividing estimated Chinese investment volume in residential real estate by the total volume of residential real estate transactions.

For the financial year 2013-14, based on FIRB statistics, it is estimated residential property investment by Chinese investors was $5.8 billion.

This is consistent with KPMG/University of Sydney (USYD) data on actual Chinese investment in Australia.

According to the Australian Bureau of Statistics, the total sales value of residential property in Australia for the same period was $258 billion.

Residential versus commercial

However, the figure of $5.8 billion invested in residential property for the financial year 2013-14 is an estimate because FIRB data for each country only lists the total value of approved real estate investment without differentiating between commercial and residential real estate.

The split between commercial and residential real estate is only available for the overall investment approved for all foreign countries.

For 2013-14, the ratio between commercial and residential real estate was 53 to 47.

Applying this ratio to the total approved volume of Chinese real estate investment of $12.4 billion, an estimate of $5.8 billion for residential investment and $6.6 billion for commercial real estate investment can be obtained.

It is important to keep in mind that FIRB approval figures are generally higher than actual investment figures.

For commercial real estate investment the KPMG/USYD database shows that actual investment volume was $4.4 billion in the 2014 calendar year, which is lower than the FIRB approval figures.

Foreign investment in Australian real estate 2013-14

Total sales value of residential property

For the financial year 2013-14, the ABS recorded 482,720 property transfers.

The average price of residential properties in Australia increased by 6.3 per cent from $516,300 in the September 2013 quarter to 548,900 in the June 2014 quarter.

Using ABS quarterly Residential Property Price Indexes data, we obtained a total sales value of residential property in Australia of $258 billion.

The scale of Chinese investment

Based on FIRB data, overall foreign investment accounts for 13.4 per cent of total residential real estate investment, while Chinese residential investment in the Australian real estate market lies near the 2 per cent mark.

These estimates are aligned with the NAB Quarterly Australian Residential Property Surveys.

These show demand by all foreign buyers fluctuating between 12.5 per cent and 10.2 per cent for new properties and 8 per cent and 7.2 per cent for established properties for financial year 2013-14.

With declining economic growth and an increasingly weakening Australian dollar, the issue of foreign investment in the Australian residential real estate market will not subside in the foreseeable future.

Before suggesting Chinese investors are a major factor behind declining affordability, commentators should at least consider the data.

Information on Chinese investment in Australian real estate relies on data sets which are compiled for different purposes and produce a variety of different and sometimes incompatible results.

The House of Representatives Standing Committee on Economics in its 2014 Report on Foreign Investment in Residential Real Estate highlights the discrepancy between official FIRB and ABS data and concludes that detailed information on Chinese investment in Australia's residential property markets is not available.

But based on the data we do have, Chinese investment in Australian residential real estate accounts for just 2 per cent of the total real estate sales volume.